/Engine/Source/Runtime/Core/Public/Delegates/DelegateSignatureImpl.inl
Static: Creates a weak object C++ lambda delegate technically this works for any functor types, but lambdas are the primary use case
template<typename UserClass, typename FunctorType, typename... VarTypes> static TDelegate< RetValType(ParamTypes...), UserPolicy > CreateWeakLambda &40; UserClass &42; InUserObject, FunctorType && InFunctor, VarTypes &&... Vars &41;